What I think your saying Is that he snorted at you like any other deer would do when they don't like something or are unsure about something. If that's the case In means the same thing as any other deer snorting at you (warning call kinda thing to the other deer).

I've always wondered though myself If a big mature buck would or does snort like a doe will? Or do they just sneak off and get, that's what I've always seen them do. I've never seen a big guy snort yet.